<template>
  <div class="breadcrumb">
    <el-button
      icon="ArrowLeftBold"
      round
      type="info"
      plain
      title="返回"
      v-if="showBack"
      @click="handleBack"
    />
    <el-breadcrumb class="app-breadcrumb" separator="/">
      <transition-group name="breadcrumb">
        <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
          <span
            v-if="
              item.redirect === 'noRedirect' || index == levelList.length - 1
            "
            class="no-redirect"
            >{{ item.meta.title }}</span
          >
          <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
        </el-breadcrumb-item>
      </transition-group>
    </el-breadcrumb>
  </div>
</template>

<script lang="ts" setup>
import { computed, onMounted, ref, watch } from 'vue'
import { useRouter, useRoute, RouteLocationMatched } from 'vue-router'

const route = useRoute()
const router = useRouter()
const levelList = ref<RouteLocationMatched[]>([])

const showBack = computed(() => {
  return route.meta.back
})
const handleBack = () => {
  router.go(-1)
}

watch(
  () => route,
  () => {
    getBreadcrumb()
  },
  {
    deep: true,
  },
)

onMounted(() => {
  getBreadcrumb()
})

const getBreadcrumb = () => {
  const matched = route.matched.filter((item) => item.meta && item.meta.title)

  levelList.value = matched.filter(
    (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false,
  )
}

const handleLink = (item: RouteLocationMatched) => {
  const { path, redirect } = item
  if (redirect) {
    router.push(path)
  }
  router.push(path)
}
</script>

<style lang="scss" scoped>
.breadcrumb {
  display: flex;
  align-items: center;
  padding: 0 10px;
}
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
